Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-01-17
1996-12-10
Ben, Loha
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369106, 369 4425, 369 4429, 369 4435, 369 32, 369 50, 369 54, 360 7303, G11B 700
Patent
active
055838413
ABSTRACT:
In a data reproducing apparatus, an optical pick-up is radially movable with respect to, and recovers information from, an information storage member. A motor rotates an information storage member. A spindle servo controls the speed of rotation of the motor in response to a timing signal, to provide constant linear velocity between the information storage member and the optical pick-up. A signal processor creates a recovered timing signal from the information recovered by the optical pick-up, and passes the recovered timing signal to a switching circuit. During normal playback, the switching circuit passes the recovered timing signal to the spindle servo as the timing signal. During search, a controller directs an oscillator to output a reference timing signal to the switching circuit. A controller directs the switching circuit to pass the reference timing signal to the spindle servo as the timing signal while the optical pick-up is moving radially with respect to the information storage member. When the optical pick-up reaches or nears the target track on the information storage member, the controller directs the switching circuit to again pass the recovered timing signal to the spindle servo.
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Ben Loha
Bickel Arthur S.
Braun Robert T.
Clark Ronald J.
Discovision Associates
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